Biomedical subjects

N Papadakis

Publications and source records attributed to N Papadakis.

40 records · Page 3Linked to original sources

PubMedDate not supplied

A prospective cohort study of the outcome of acute whiplash injury in Greece.

OBJECTIVE: An earlier pilot study suggested that the late whiplash syndrome is uncommon in Greece. The purpose of the present study is to extend the evaluation to a larger sample, and include the prevalence of specific symptoms in the evaluation. METHODS: In a prospective, cohort study, a total of 180 accident victims were consecutively recruited following Emergency ward presentation. A standard questionnaire asked about neck pain, headache, shoulder pain, limb numbness or pain, and dizziness. Accident victims were followed for 6 months. RESULTS: In the initial 4 weeks after the accident, accident victims reported neck pain, headache, shoulder pain, arm numbness or pain, and dizziness, but at 4 weeks more than 90% had recovered from these, the remainder of the subjects having minor symptoms (not requiring therapy), and returning to their pre-accident state of health (which included minor symptoms). There were no cases of chronic disability. CONCLUSION: In Greece, symptoms after an acute whiplash injury are self-limiting, brief, and do not appear to evolve into the so-called late whiplash syndrome.

Acute Disease↗

PubMedDate not supplied

Suprasellar and intrasellar paragangliomas.

Neoplasms of the sellar region are entities with a large differential diagnosis. Although paraganglionic cells have not been demonstrated in the pituitary or adjacent structures, the existence of sellar region paragangliomas is well-documented. To elucidate, in this area the nature of these unusual tumors is relatively difficult. Clinical history, physical examination, radiographic investigation as well as intraoperative gross observation are the same as those of sellar meningioma or pituitary adenoma. Immunohistochemistry, using neuroendocrine markers and electron microscopy are the two definitive diagnostic methods to differentiate among these entities. The clinical management, the possible pathogenesis of the tumor, the importance of immunohistochemistry in making the diagnosis and the clinical outcome of these patients are discussed.

Adenoma↗

PubMedDate not supplied

In vivo proton MR spectroscopy: the diagnostic possibilities of lipid resonances in brain tumors.

The lipid resonances detected in proton MR spectra of brain tumors were evaluated from the diagnostic point of view. Seventy five non-radiated brain tumors were examined in vivo and lipids were detected in 29% of anaplastic astrocytomas grade III, 60% of glioblastomas multiforme and 50% of metastatic tumors. Lipids were also detected in all brain abscesses and an epidermoid cyst. No lipids were detected in benign tumors (low grade and pilocytic astrocytomas, oligodendrogliomas, meningiomas, pituitary adenomas etc.). Thus, the presence of lipids in the MR spectra is indicative of malignancy (with a few exceptions).

Brain Neoplasms↗

PubMedDate not supplied

Microvessel density in brain tumors.

Sections from formalin fixed paraffin embedded tumor tissue from 165 patients with brain tumors including 62 meningiomas, 80 supratentorial astrocytomas (19 astrocytomas-grade I/II, 20 anaplastic astrocytomas-grade III, 41 glioblastomas-grade IV), 7 cerebellar astrocytomas-grade I/II, one gliosarcoma, 7 oligodendrogliomas, 3 ependymomas and 5 medulloblastomas were immunostained for factor VIII-related antigen in order to highlight microvessel endothelial cells. Microvessel count (MVC; the highest number of microvessels in three areas of highest vascular density at X200 magnification) was determined and correlated with histological grade of tumors and patients' sex and age. The mean MVC was 27.9 in meningiomas. Astrocytic tumors, particularly malignant astrocytomas (grade III, IV), were highly vascular. The mean MVC as regards the supratentorial astrocytic neoplasms was 14.5 in astrocytomas (grade I/II), 42.3 in anaplastic astrocytomas (grade III) and 50.2 in glioblastomas (grade IV). All cerebellar astrocytomas studied, even though well differentiated (grade I/II), were highly vascularised tumors (MVC: 41.1. A comparison of the mean MVC vlaues showed that there was a statistically significant difference between supratentorial astrocytomas (Grade I-II) and cerebellar astrocytomas (Grade I-II) (p = 0.0004), anaplastic astrocytomas (Grade I-II) (p = 0.00004) and glioblastomas (p = 0.00001). There was no significant difference between cerebellar astrocytomas and anaplastic astrocytomas (p = 0.8) and glioblastomas (p = 0.4). Astrocytic neoplasms showed statistically significant higher mean MVC from meningiomas (p = 0.002). The mean MVC was 14.1 in oligodendrogliomas, 22.7 in ependymomas and 19.6 in medulloblastomas. In one gliosarcoma that was studied the MVC was 40. The MVC appeared to be independent of the age and sex of patients. This study supports the importance of microvessel density as a measure of angiogenesis, as well as a further morphologic feature in the classification of brain tumors. The determination of microvessel density may become useful in the planning and monitoring of anti-angiogenesis therapies of these tumors.

Adult↗